Modelling pollen 3d mesh
I'm not sure about what you mean with the random wireframe overlapping. To make this object I think you should fake the texture rather than model it, I see at least 2 ways:


With a Noise node > Height of a Bump node > Normal of a Diffuse. Here I've even mixed 2 noises in a MixRGB to give a bit more complexity. I also added a Layer Weight at the end, if necessary.






You could also create a repeatable texture from your original image. Unwrap your object, in the 3D view / Texture Paint mode, use the Stencil brush to paint on your object with your texture, and again use this with a Bump node.